[llvm-bugs] Issue 62394 in oss-fuzz: llvm:llvm-special-case-list-fuzzer: Use-after-poison in llvm::line_iterator::line_iterator

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Unreproducible OS-Linux Proj-llvm Security_Severity-High Engine-honggfuzz Reported-2023-09-15
Type: Bug-Security

New issue 62394 by ClusterFuzz-External: llvm:llvm-special-case-list-fuzzer: Use-after-poison in llvm::line_iterator::line_iterator
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=62394

Detailed Report: https://oss-fuzz.com/testcase?key=4901543344996352

Project: llvm
Fuzzing Engine: honggfuzz
Fuzz Target: llvm-special-case-list-fuzzer
Job Type: honggfuzz_asan_llvm
Platform Id: linux

Crash Type: Use-after-poison READ 1
Crash Address: 0x7fffe35e5004
Crash State:
  llvm::line_iterator::line_iterator
  llvm::SpecialCaseList::parse
  llvm::SpecialCaseList::create
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Crash Revision: https://oss-fuzz.com/revisions?job=honggfuzz_asan_llvm&revision=202309020611

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=4901543344996352

Issue filed automatically.

See https://google.github.io/oss-fuzz/advanced-topics/reproducing for instructions to reproduce this bug locally.

************************* UNREPRODUCIBLE *************************
Note: This crash might not be reproducible with the provided testcase. That said, for the past 14 days, we've been seeing this crash frequently.

It may be possible to reproduce by trying the following options:
- Run testcase multiple times for a longer duration.
- Run fuzzing without testcase argument to hit the same crash signature.

If it still does not reproduce, try a speculative fix based on the crash stacktrace and verify if it works by looking at the crash statistics in the report. We will auto-close the bug if the crash is not seen for 14 days.
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